While our EFI binaries execute without problems on EDK II they crash on a Lenovo X13s. Let our binaries look more like what EDK II produces:
* move all writable data to a .data section * align sections to 4 KiB boundaries (matching EFI page size) * remove IMAGE_SCN_LNK_NRELOC_OVFL from .reloc section flags
Signed-off-by: Heinrich Schuchardt heinrich.schuchardt@canonical.com --- v2: use constants for section flags remove IMAGE_SCN_LNK_NRELOC_OVFL from .reloc section flags --- arch/arm/lib/crt0_aarch64_efi.S | 48 +++++++++++++++++++++++--------- arch/arm/lib/elf_aarch64_efi.lds | 6 ++-- 2 files changed, 39 insertions(+), 15 deletions(-)
diff --git a/arch/arm/lib/crt0_aarch64_efi.S b/arch/arm/lib/crt0_aarch64_efi.S index b4fc263adf..da8db43828 100644 --- a/arch/arm/lib/crt0_aarch64_efi.S +++ b/arch/arm/lib/crt0_aarch64_efi.S @@ -25,7 +25,7 @@ pe_header: .long IMAGE_NT_SIGNATURE /* 'PE' */ coff_header: .short IMAGE_FILE_MACHINE_ARM64 /* AArch64 */ - .short 2 /* nr_sections */ + .short 3 /* nr_sections */ .long 0 /* TimeDateStamp */ .long 0 /* PointerToSymbolTable */ .long 0 /* NumberOfSymbols */ @@ -40,7 +40,7 @@ optional_header: .short IMAGE_NT_OPTIONAL_HDR64_MAGIC /* PE32+ format */ .byte 0x02 /* MajorLinkerVersion */ .byte 0x14 /* MinorLinkerVersion */ - .long _edata - _start /* SizeOfCode */ + .long _etext - _start /* SizeOfCode */ .long 0 /* SizeOfInitializedData */ .long 0 /* SizeOfUninitializedData */ .long _start - ImageBase /* AddressOfEntryPoint */ @@ -48,7 +48,7 @@ optional_header:
extra_header_fields: .quad 0 /* ImageBase */ - .long 0x200 /* SectionAlignment */ + .long 0x1000 /* SectionAlignment */ .long 0x200 /* FileAlignment */ .short 0 /* MajorOperatingSystemVersion */ .short 0 /* MinorOperatingSystemVersion */ @@ -100,25 +100,47 @@ section_table: .long 0 /* PointerToLineNumbers */ .short 0 /* NumberOfRelocations */ .short 0 /* NumberOfLineNumbers */ - .long 0x42100040 /* Characteristics (section flags) */ - + /* Characteristics (section flags) */ + .long (IMAGE_SCN_MEM_READ | \ + IMAGE_SCN_MEM_DISCARDABLE | \ + IMAGE_SCN_CNT_INITIALIZED_DATA)
.ascii ".text" .byte 0 .byte 0 .byte 0 /* end of 0 padding of section name */ - .long _edata - _start /* VirtualSize */ + .long _etext - _start /* VirtualSize */ .long _start - ImageBase /* VirtualAddress */ - .long _edata - _start /* SizeOfRawData */ + .long _etext - _start /* SizeOfRawData */ .long _start - ImageBase /* PointerToRawData */ + .long 0 /* PointerToRelocations */ + .long 0 /* PointerToLineNumbers */ + .short 0 /* NumberOfRelocations */ + .short 0 /* NumberOfLineNumbers */ + /* Characteristics (section flags) */ + .long (IMAGE_SCN_MEM_READ | \ + IMAGE_SCN_MEM_EXECUTE | \ + IMAGE_SCN_CNT_CODE)
- .long 0 /* PointerToRelocations (0 for executables) */ - .long 0 /* PointerToLineNumbers (0 for executables) */ - .short 0 /* NumberOfRelocations (0 for executables) */ - .short 0 /* NumberOfLineNumbers (0 for executables) */ - .long 0xe0500020 /* Characteristics (section flags) */ + .ascii ".data" + .byte 0 + .byte 0 + .byte 0 /* end of 0 padding of section name */ + .long _data_size /* VirtualSize */ + .long _data - ImageBase /* VirtualAddress */ + .long _data_size /* SizeOfRawData */ + .long _data - ImageBase /* PointerToRawData */ + .long 0 /* PointerToRelocations */ + .long 0 /* PointerToLineNumbers */ + .short 0 /* NumberOfRelocations */ + .short 0 /* NumberOfLineNumbers */ + .long 0xc0000040 /* Characteristics (section flags) */ + /* Characteristics (section flags) */ + .long (IMAGE_SCN_MEM_WRITE | \ + IMAGE_SCN_MEM_READ | \ + IMAGE_SCN_CNT_INITIALIZED_DATA)
- .align 9 + .align 12 _start: stp x29, x30, [sp, #-32]! mov x29, sp diff --git a/arch/arm/lib/elf_aarch64_efi.lds b/arch/arm/lib/elf_aarch64_efi.lds index c0604dad46..ffc6f6e604 100644 --- a/arch/arm/lib/elf_aarch64_efi.lds +++ b/arch/arm/lib/elf_aarch64_efi.lds @@ -18,11 +18,13 @@ SECTIONS *(.gnu.linkonce.t.*) *(.srodata) *(.rodata*) + . = ALIGN(16); + *(.dynamic); . = ALIGN(512); } _etext = .; _text_size = . - _text; - .dynamic : { *(.dynamic) } + . = ALIGN(4096); .data : { _data = .; *(.sdata) @@ -48,11 +50,11 @@ SECTIONS _bss_end = .; _edata = .; } + _data_size = _edata - _data; .rela.dyn : { *(.rela.dyn) } .rela.plt : { *(.rela.plt) } .rela.got : { *(.rela.got) } .rela.data : { *(.rela.data) *(.rela.data*) } - _data_size = . - _etext;
. = ALIGN(4096); .dynsym : { *(.dynsym) }